Oscillations in β Ursae Minoris -: Observations with SMEI

被引：19

作者：

Tarrant, N. J. ^{[1
]}

Chaplin, W. J. ^{[1
]}

Elsworth, Y. ^{[1
]}

Spreckley, S. A. ^{[1
]}

Stevens, I. R. ^{[1
]}

机构：

[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

来源：

ASTRONOMY & ASTROPHYSICS | 2008年 / 483卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

stars : individual : beta UMi; stars : oscillations; stars : interiors; stars : fundamental parameters;

D O I：

10.1051/0004-6361:200809738

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. From observations of the K4III star beta UMi we attempt to determine whether oscillations or any other form of variability is present. Methods. A high-quality photometric time series of approximate to 1000 days in length obtained from the SMEI instrument on the Coriolis satellite is analysed. Various statistical tests were performed to determine the significance of features seen in the power density spectrum of the light curve. Results. Two oscillations with frequencies 2.44 and 2.92 mu Hz have been identified. We interpret these oscillations as consecutive overtones of an acoustic spectrum, implying a large frequency spacing of 0.48 mu Hz. Using derived asteroseismic parameters in combination with known astrophysical parameters, we estimate the mass of beta UMi to be 1.3 +/- 0.3 M-circle dot. Peaks of the oscillations in the power density spectrum show width, implying that modes are stochastically excited and damped by convection. The mode lifetime is estimated at 18 +/- 9 days.

引用

页码：L43 / L46

页数：4

共 50 条

[11] On the hydrogen-deficient nature of Z Ursae Minoris
Goswami, A
Rao, NK
Lambert, DL
Gonzalez, G
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1997, 109 (737) : 796 - 798
[12] RW Ursae Minoris (1956): An evolving postnova system
Bianchini, A
Tappert, C
Canterna, R
Tamburini, F
Osborne, H
Cantrell, K
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2003, 115 (809) : 811 - 818
[13] The near-contact binary RU ursae minoris
Li-Ying, Zhu
Sheng-Bang, Qian
Fu-Yuan, Xiang
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2006, 58 (02) : 361 - 366
[14] The near-contact binary system RU ursae minoris
Maxted, PFL
Hilditch, RW
OBSERVATORY, 1996, 116 (1134): : 288 - 293
[15] Monitoring the late decline of the old nova RW Ursae Minoris
Tamburini, F.
Di Mille, F.
Bianchini, A.
Johnson, P.
ASTRONOMY & ASTROPHYSICS, 2007, 464 (02) : 697 - 700
[16] ORBITAL MOTION OF ALPHA URSAE MINORIS FROM RADIAL VELOCITIES
ROEMER, E
ASTROPHYSICAL JOURNAL, 1965, 141 (04): : 1415 - &
[17] Planetary companions in K giants β Cancri, μ Leonis, and β Ursae Minoris
Lee, B. -C.
Han, I.
Park, M. -G.
Mkrtichian, D. E.
Hatzes, A. P.
Kim, K. -M.
ASTRONOMY & ASTROPHYSICS, 2014, 566
[18] SPECTROGRAPHIC OBSERVATIONS OF THE ECLIPSING VARIABLES W-URSAE MINORIS, XZ-SAGITTARII, AND KO-AQUILAE
SAHADE, J
ASTROPHYSICAL JOURNAL, 1945, 102 (03): : 470 - &
[19] SMEI observations in the STEREO era
Jackson, Bernard V.
Buffington, Andrew
Hick, P. Paul
Bisi, Mario M.
Jensen, Elizabeth A.
SOLAR PHYSICS AND SPACE WEATHER INSTRUMENTATION II, 2007, 6689
[20] The Slow Late Decline of the Old Nova RW Ursae Minoris (1956)
Bianchini, A.
di Mille, F.
Tamburini, F.
Saygac, A. T.
Alis, S.
STELLA NOVAE: PAST AND FUTURE DECADES, 2014, 490 : 221 - 224

← 1 2 3 4 5 →